Difference between Firewall and Gateway
Below are most common differences between Firewall and Gateway
(1)Gateway:-A NETWORK gateway will join networks together with the help of HARDWARE and software.
(1)Firewall:-A network firewall will protect computer network from unauthorized incoming or outgoing access.

(2)Gateway:-Its a networking hardware or node which connects two disparate network to COMMUNICATE each other.
(2)Firewall:-A firewall is both hardware and software application which sets the rules as per which data packets are allowed to enter the network.

(3)Gateway:-Most common gateways are computer and router which can connect an enterprise to the INTERNET.
(3)Firewall:-Network firewalls may be hardware DEVICES or software programs.

(4)Gateway:-Types of Gateway
(i)Unidirectional Gateways
(ii)Bidirectional Gateways
(4)Firewall:-Types of Firewall
(i)Packet filtering firewalls
(ii)Circuit-level gateways
(iii)Stateful inspection firewalls
(iv)Application-level gateways
(v)Next-gen firewalls